mirror of
https://github.com/saitohirga/WSJT-X.git
synced 2024-11-22 12:23:37 -05:00
98 lines
2.4 KiB
Fortran
98 lines
2.4 KiB
Fortran
subroutine genwspr4(msg0,ichk,msgsent,msgbits,i4tone)
|
|
|
|
! Encode an FT4 message
|
|
! Input:
|
|
! - msg0 requested message to be transmitted
|
|
! - ichk if ichk=1, return only msgsent
|
|
! - msgsent message as it will be decoded
|
|
! - i4tone array of audio tone values, {0,1,2,3}
|
|
|
|
! Frame structure:
|
|
! s16 + 87symbols + 2 ramp up/down = 105 total channel symbols
|
|
! r1 + s4 + d29 + s4 + d29 + s4 + d29 + s4 + r1
|
|
|
|
! Message duration: TxT = 105*13312/12000 = 116.48 s
|
|
|
|
! use iso_c_binding, only: c_loc,c_size_t
|
|
|
|
use packjt77
|
|
include 'wspr4_params.f90'
|
|
character*37 msg0
|
|
character*37 message !Message to be generated
|
|
character*37 msgsent !Message as it will be received
|
|
character*77 c77
|
|
character*24 c24
|
|
integer*4 i4tone(NN),itmp(ND)
|
|
integer*1 codeword(2*ND)
|
|
integer*1 msgbits(74),rvec(77)
|
|
integer icos4a(4),icos4b(4),icos4c(4),icos4d(4)
|
|
integer*4 ncrc24
|
|
logical unpk77_success
|
|
data icos4a/0,1,3,2/
|
|
data icos4b/1,0,2,3/
|
|
data icos4c/2,3,1,0/
|
|
data icos4d/3,2,0,1/
|
|
data rvec/0,1,0,0,1,0,1,0,0,1,0,1,1,1,1,0,1,0,0,0,1,0,0,1,1,0,1,1,0, &
|
|
1,0,0,1,0,1,1,0,0,0,0,1,0,0,0,1,0,1,0,0,1,1,1,1,0,0,1,0,1, &
|
|
0,1,0,1,0,1,1,0,1,1,1,1,1,0,0,0,1,0,1/
|
|
message=msg0
|
|
|
|
do i=1, 37
|
|
if(ichar(message(i:i)).eq.0) then
|
|
message(i:37)=' '
|
|
exit
|
|
endif
|
|
enddo
|
|
do i=1,37 !Strip leading blanks
|
|
if(message(1:1).ne.' ') exit
|
|
message=message(i+1:)
|
|
enddo
|
|
|
|
i3=-1
|
|
n3=-1
|
|
call pack77(message,i3,n3,c77)
|
|
call unpack77(c77,0,msgsent,unpk77_success) !Unpack to get msgsent
|
|
msgbits=0
|
|
read(c77,'(50i1)') msgbits(1:50)
|
|
call get_crc24(msgbits,ncrc24)
|
|
write(c24,'(b24.24)') ncrc24
|
|
read(c24,'(24i1)') msgbits(51:74)
|
|
|
|
if(ichk.eq.1) go to 999
|
|
read(c77,'(74i1)',err=1) msgbits
|
|
if(unpk77_success) go to 2
|
|
1 msgbits=0
|
|
itone=0
|
|
msgsent='*** bad message *** '
|
|
go to 999
|
|
|
|
entry get_wspr4_tones_from_74bits(msgbits,i4tone)
|
|
|
|
2 msgbits=mod(msgbits+rvec(1:74),2)
|
|
call encode174_74(msgbits,codeword)
|
|
|
|
! Grayscale mapping:
|
|
! bits tone
|
|
! 00 0
|
|
! 01 1
|
|
! 11 2
|
|
! 10 3
|
|
|
|
do i=1,ND
|
|
is=codeword(2*i)+2*codeword(2*i-1)
|
|
if(is.le.1) itmp(i)=is
|
|
if(is.eq.2) itmp(i)=3
|
|
if(is.eq.3) itmp(i)=2
|
|
enddo
|
|
|
|
i4tone(1:4)=icos4a
|
|
i4tone(5:33)=itmp(1:29)
|
|
i4tone(34:37)=icos4b
|
|
i4tone(38:66)=itmp(30:58)
|
|
i4tone(67:70)=icos4c
|
|
i4tone(71:99)=itmp(59:87)
|
|
i4tone(100:103)=icos4d
|
|
|
|
999 return
|
|
end subroutine genwspr4
|